<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>
    function computed(str) {


        var newstr2 = ''
        for (var i = 0; i < str.length; i++) {
            if (str[i] == ' ') {

            } else {
                if (str[i] == '!') {
                    newstr2 += '啊'
                } else if (str[i] == 'h') {
                    newstr2 += 'H'
                } else if (str[i] == 'w') {
                    newstr2 += 'W'
                } else {
                    newstr2 += str[i]
                }
            }

        }
        let newstr1 = newstr2.split("").reverse().join('')
        return newstr1
    }
    console.log(computed(' hello world 我爱你!'));
</script>